Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

What word begins and ends with an E, but has only one letter?

A blonde put eyeliner on her head. Why?

What is the fastest way to double your money?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

How many triangles can you find in this given picture?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

Which is the smallest number that you can write using all the vowels exactly once?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?